DE102013107153B4 - Cleaning shaft and method for decentralized rainwater treatment - Google Patents

Abstract

Cleaning shaft for decentralized rainwater treatment witha) a base surface (12),b) at least one side wall (14) extending upwards from the base surface (12),c) the base surface (12) and the at least one side wall (14) together forming a base body (16) for receiving an amount of rainwater to be cleaned,d) at least one inlet (18) with an inlet end through which water to be treated can flow into an inlet area,e) means for generating a predominantly horizontal flow in the inlet area andf) at least one outlet (20), characterized in g) that the inlet (18) runs in the vertical direction in the region of the inlet end and a horizontally oriented impact surface (30) is arranged as a means for generating a horizontal flow below the inlet end in such a way that over the impact surface ( 30) a flow deflection from the vertical to the horizontal takes place, h) below the inlet (18) and at a height level a segmentation area (46) is arranged below the impact surface (30), in which the base body (16) is divided over a height Hs into a plurality of segments (38) arranged next to one another, and i) being below the segmentation area (46). unsegmented deposit area (44) is provided for depositing contaminants.

Description

The invention relates to a cleaning shaft and a method for decentralized rainwater treatment.

For reasons of environmental protection and due to legal regulations, it is necessary to clean surface runoff - especially rainwater - before it is discharged into the ground or into a body of water.

In practice, so-called compact systems have been developed for this purpose for several years, which can be used for rainwater treatment in particular where there is not enough space for conventional systems. Such a compact system, which consists of three interconnected filter shafts, is in DE 10 2008 000 775 A1 described.

Out of DE 102 31 241 A1 a filter element for water contaminated with solid particles and dissolved pollutants and a filter system equipped with such a filter element are known. The filter element is formed from a shaped body made of porous concrete and is arranged in particular as a partition wall between a lower compartment and an upper compartment in the filter system.

Out of DE 10 2005 056 018 A1 a method and a system for avoiding calcium carbonate deposits (sintering) in drainage systems are known. The system comprises a duct with a supply line, the end of the supply line leading vertically downwards into an area of the duct below a lamellar insert. As a result, turbulent flows are regularly generated in the inflow area below the lamella insert during the inflow of water.

Out of US 6,062,767A a cleaning shaft for rainwater according to the preamble of claim 1 is known.

Out of DE 10 2007 034 213 A1 a settling tank for liquids containing sedimentable solids is known, the settling tank having an inlet and an outlet. In one embodiment, a retaining device is arranged in the settling tank, which can be formed by a grid, sieve or rake. The retaining device is intended to prevent solids that have already settled out from being whirled up again by the water that has entered in the event of a strong inflow.

The object of the invention is to provide a cleaning shaft and a method for decentralized rainwater treatment, the space requirement of which is further reduced and which nevertheless enable decentralized rainwater treatment to be as efficient as possible.

The object is achieved according to the invention with the features of claims 1 and 8.

• a) eine Bodenfläche,
• b) mindestens eine sich von der Bodenfläche nach oben erstreckende Seitenwand,
• c) wobei die Bodenfläche und die mindestens eine Seitenwand zusammen einen Grundkörper zur Aufnahme einer zu reinigenden Regenwassermenge bilden,
• d) mindestens einen Zulauf mit einem Zulaufende, über welches zu behandelndes Wasser in einen Zulaufbereich einströmen kann,
• e) Mittel zur Erzeugung einer im Wesentlichen horizontalen Strömung im Zulaufbereich und
• f) mindestens einen Ablauf,
• g) wobei der Zulauf im Bereich des Zulaufendes in vertikaler Richtung verläuft und als Mittel zur Erzeugung einer horizontalen Strömung unterhalb des Zulaufendes eine horizontal ausgerichtete Prallfläche derart angeordnet ist, dass über die Prallfläche eine Strömungsumlenkung von der Vertikalen in die Horizontale erfolgt,
• h) wobei unterhalb des Zulaufs und auf einem Höhenniveau unterhalb der Prallfläche ein Segmentierungsbereich angeordnet ist, in welchem der Grundkörper über eine Höhe Hs in eine Vielzahl von nebeneinander angeordneten Segmenten unterteilt ist,
• i) und wobei unterhalb des Segmentierungsbereichs ein unsegmentierter Ablagerungsbereich für sich ablagernde Schmutzstoffe vorgesehen ist.

A cleaning shaft according to the invention for decentralized rainwater treatment

• a) a floor area,
• b) at least one side wall extending upwards from the bottom surface,
• c) wherein the bottom surface and the at least one side wall together form a base body for receiving an amount of rainwater to be cleaned,
• d) at least one inlet with an inlet end through which water to be treated can flow into an inlet area,
• e) means for generating a substantially horizontal flow in the inlet area and
• f) at least one process,
• g) where the inlet runs in a vertical direction in the region of the inlet end and a horizontally oriented impact surface is arranged below the inlet end as a means for generating a horizontal flow in such a way that the flow is deflected from the vertical to the horizontal via the impact surface,
• h) a segmentation area being arranged below the inlet and at a level below the impact surface, in which the base body is divided over a height Hs into a large number of segments arranged next to one another,
• i) and wherein an unsegmented deposit area for depositing contaminants is provided below the segmentation area.

Such a cleaning shaft enables a surprisingly efficient cleaning of rainwater in a simple manner without the need for known filter elements, in particular because the structural design of the cleaning shaft promotes and supports infiltration of pollutants in terms of flow. For this purpose, rainwater is set into a predominantly horizontal flow movement via the inlet and additional means in the cleaning shaft. For this purpose, in the case of the inlet ending vertically, an impact surface is arranged transversely to the direction of extent of the inlet, impact surfaces at an angle of 90°+/-45° to the vertical being particularly suitable in this case. For Depending on the geometry of the shaft and the inlet, it can also make sense to arrange other and/or additional suitable flow-guiding elements in the inlet for optimum flow through the entire cross-sectional area of the shaft, for example to widen a selective inlet line. In the case of a flow deflection from the vertical to the horizontal via a baffle, the flow propagation in the horizontal occurs naturally over the entire cross-sectional area of the well. From the essentially horizontal flow of the water, sinking contaminants reach the segmentation area, in which the base body is divided into a number of segments over a height Hs. This area reduces the horizontal flow space for the water and promotes a further sinking of the pollutants towards the bottom surface. Tests have shown that contaminants that have entered the segmentation area retain their sinking motion and the segmentation area can thus effectively prevent such contaminants later escaping via the outlet and getting back into the environment.

A cleaning shaft according to the invention is very compact because it is designed as a one-shaft system. The cleaning shaft consists of a base body into which the water flows and from which the water flows out again, whereby it is neither necessary to create space for further base bodies nor to separate different areas within the base body, which must necessarily be flown through one after the other, e.g. next to each other or superimposed areas. The cleaning shaft according to the invention enables efficient water cleaning with a particularly simple structural design.

In a practical embodiment of the cleaning shaft according to the invention, the height Hs of the segmentation area of the cleaning container is at least 20 percent of the width B of the cleaning shaft in the segmentation area. The height Hs is preferably at least 30 percent and particularly preferably 50 percent.

Due to the design, transverse flows in the segmentation area are preferably only possible within the segments, in that the walls between the segments are free of recesses. Areas in which walls with recesses are provided between the individual segments should also be regarded as a segmentation area within the meaning of the invention if the area of all the recesses in the respective walls between two segments is a maximum of 20 percent of the total wall area (including recesses).

An unsegmented deposit area for depositing contaminants is provided below the segmentation area. As a result, the volume below the segmentation area can be used particularly efficiently for depositing contaminants. It has been shown that in this case the contaminants in the deposit area are distributed substantially evenly over the entire floor area.

In a further practical embodiment of the cleaning shaft according to the invention, the segmentation area comprises a multiplicity of flow-through elements arranged next to one another, each with a similar, preferably the same, cross-section. Flow-through elements with a base area that has a width-to-length ratio of between 0.8 and 1.2 are particularly preferred, in particular those with an oval, circular or square base surface; flow-through elements of hollow-cylindrical design are particularly preferred. Similar cross-sections are understood to mean in particular those that have an essentially identical basic shape and/or whose cross-sectional area size—based on the average size—deviates by a maximum of 50 percent, preferably a maximum of 40 percent and particularly preferably a maximum of 30 percent.

The bottom surface and the at least one side wall preferably also have an oval, in particular circular, contour. A hollow-cylindrical base body that is open at the top is particularly preferred.

Tests have shown that with the above-mentioned oval and in particular circular contours in the flow-through elements and the base body, a particularly uniform flow movement and a particularly efficient cleaning effect that is presumably attributable thereto is achieved.

Both above and below the inlet area, it can be advantageous to form a collar element in the cleaning shaft according to the invention, which collar element extends from the at least one side wall towards the center of the shaft. Such a collar element can be used in particular to influence the flow and/or as a bearing surface for another element. In particular, a separately formed segmentation element can be placed on a collar element formed below the inflow area, which can be used completely or partially to form a segmentation area. A collar element formed above the inflow area can be used, on the one hand, to create a collar element in the area of the at least one side to counteract wall-adjusting, upward flow. On the other hand, such a collar element can serve as a bearing surface for a filter element. As an example of such a filter element, reference is made in particular to the FILTAPEX® system. However, all other filter types are also conceivable, such as porous plates, filter materials, etc.

The base body of a cleaning shaft according to the invention can be made in one piece from plastic in a particularly simple and cost-effective manner, with the base body comprising at least the bottom surface and at least one side wall. Alternatively, the impact surface, any collar elements, openings for inflow and outflow and/or a complete inflow and outflow, in particular with tubular elements branching off horizontally from the base body, can also be formed in one piece with the bottom surface and the at least one side wall. The welding of standard plastic parts and/or the plastic injection molding of simple or more complex geometries are particularly suitable as manufacturing processes.

In a further practical embodiment of the cleaning shaft according to the invention, a stop for a pitot tube is formed on at least one segment, preferably in the lower half. Such a stop can--particularly when the corresponding segment is to be used as a guide for a pitot tube for suctioning off dirt--correct positioning of the pitot tube can be ensured and damage to the floor surface can be avoided.

1. a) Wasser über einen Zulaufbereich eines Zulaufs in einen Reinigungsschacht eingeleitet und über einen Ablauf aus dem Reinigungsschacht abgeleitet wird, wobei der Reinigungsschacht eine Bodenfläche und mindestens eine sich von der Bodenfläche nach oben erstreckende Seitenwand aufweist,
2. b) wobei das eingeleitete Wasser im Zulaufbereich über einen im Bereich des Zulaufendes in vertikaler Richtung verlaufenden Zulauf und eine unterhalb des Zulaufendes angeordnete, horizontal ausgerichtete Prallfläche in eine im Wesentlichen horizontale Bewegung versetzt wird
3. c) und wobei unterhalb des Zulaufbereichs und auf einem Höhenniveau unterhalb der Prallfläche in einem Segmentierungsbereich durch eine Vielzahl von nebeneinander angeordneten Segmenten über eine Höhe Hs einer Bildung von Querströmungen zwischen den Segmenten entgegengewirkt wird, um eine Ablagerung von Schmutzstoffen in einem Ablagerungsbereich unter dem Segmentierungsbereich strömungstechnisch zu begünstigen.

The invention also relates to a method for decentralized rainwater treatment, according to which

1. a) water is fed into a cleaning shaft via an inlet area of an inlet and drained out of the cleaning shaft via an outlet, the cleaning shaft having a bottom surface and at least one side wall extending upwards from the bottom surface,
2. b) the introduced water in the inlet area being set in a substantially horizontal movement via an inlet running in the vertical direction in the area of the inlet end and a horizontally oriented impact surface arranged below the inlet end
3. c) and wherein below the inflow area and at a height level below the impact surface in a segmentation area, a plurality of segments arranged next to one another counteract the formation of cross-flows between the segments over a height Hs in order to flow-technically prevent a deposition of contaminants in a deposition area below the segmentation area to favor.

The cleaning shaft is in particular a cleaning shaft as described above.

• 1 eine erste Ausführungsform eines erfindungsgemäßen Reinigungsschachts in einer Ansicht von vorne,
• 2 den in 1 gezeigten erfindungsgemäßen Reinigungsschacht in einer Seitenansicht,
• 3 den in den 1 und 2 gezeigten erfindungsgemäßen Reinigungsschacht in einer Ansicht von oben,
• 4 den in den 1 bis 3 gezeigten erfindungsgemäßen Reinigungsschacht in einer Ansicht von unten,
• 5 den in den 1 bis 4 gezeigten erfindungsgemäßen Reinigungsschacht in einer Schnittdarstellung gemäß der Linie V-V in 3,
• 6 den in den 1 bis 5 gezeigten erfindungsgemäßen Reinigungsschacht in einer Schnittdarstellung gemäß der Linie VI-VI in 3,
• 7 den in den 1 bis 6 gezeigten erfindungsgemäßen Reinigungsschacht in einer perspektivischen Darstellung mit teilweise geschnittenen Elementen,
• 8 eine zweite Ausführungsform eines erfindungsgemäßen Reinigungsschachts mit eingesetztem Filterelement in einer Schnittansicht analog zu 5 und
• 9 den in 8 gezeigten erfindungsgemäßen Reinigungsschacht in einer perspektivischen Darstellung mit teilweise geschnittenen Elementen.

Further practical embodiments and advantages of the invention are described below in connection with the drawings. Show it:

• 1 a first embodiment of a cleaning shaft according to the invention in a front view,
• 2 the in 1 shown cleaning shaft according to the invention in a side view,
• 3 the in the 1 and 2 shown cleaning shaft according to the invention in a view from above,
• 4 the in the 1 until 3 shown cleaning shaft according to the invention in a view from below,
• 5 the in the 1 until 4 shown cleaning shaft according to the invention in a sectional view along the line VV in 3 ,
• 6 the in the 1 until 5 shown cleaning shaft according to the invention in a sectional view along the line VI-VI in 3 ,
• 7 the in the 1 until 6 shown cleaning shaft according to the invention in a perspective view with partially sectioned elements,
• 8th a second embodiment of a cleaning shaft according to the invention with inserted filter element in a sectional view analogous to 5 and
• 9 the in 8th shown cleaning shaft according to the invention in a perspective view with partially sectioned elements.

the 1 until 7 show various views of a cleaning shaft 10 according to the invention with a circular base surface 12 and a side wall 14 extending upwards from the base surface 12, the base surface 12 and the side wall 14 together forming a hollow-cylindrical base body 16 which is open at the top.

In the upper area of the base body 16 are part of an inlet 18 and part of an outlet 20 horizontally extending, hollow-cylindrical connection elements 22, 24 are formed.

On the inside of the base body 16 20 baffles 26, 28 are arranged as a further part of the inlet 18 and the outlet. As in particular in the 3 , 5 , 6 and 7 can be seen, the baffles 26, 28 have a circular arc-shaped contour and extend in the vertical direction. From the 5 , 6 and 7 It can also be seen that the baffle walls 26, 28 in the area of the inlet 18 and the outlet 20 extend from an area above the connection elements 22, 24 to an area below the connection elements 22, 24, with the baffle wall 26 in the area of the inlet 18 has a slightly greater height Hz than the height H _A of the baffle 28 in the area of the outlet 20.

The flow cross-sectional area A _DZ of the inlet 18 in the area of the baffle 26 is in 3 shown in dots and is constant over the height Hz of the inlet 18 . It has an approximately semi-circular contour.

Below the baffle 26 in the area of the inlet 18, an impact surface 30 is arranged as a means for generating a substantially horizontal flow, which - as in the 5 and 7 can be seen - extends to the side wall 14 and insofar also has an approximately semicircular contour.

The impact surface 30 is larger than the flow cross-sectional area A _DZ of the inlet 18 in the area of the lower end. The impact surface 30 is also arranged as an extension of the flow cross-sectional area A _DZ of the inlet 18 in the area of the lower end, so that water exiting from the inlet 18, provided it is not deflected by the flow, flows directly onto the impact surface 30 and from there essentially horizontally Is deflected toward the center of the cleaning shaft 10. A flow in other directions is prevented by the water flowing in or by the side wall 14 directly adjoining the impact surface 30 .

As in the 3 , 5 , 6 and 7 As can be seen, around the baffle wall 26 in the region of the lower end of the baffle wall 26 there is a collar element 32 in the form of a segment of a circular ring, which collar element 32 extends from the side wall 14 in the direction of the center of the cleaning shaft 10 . The collar element 32 has the effect in particular that water flowing from the impact surface 30 essentially in the horizontal direction flows from below against the collar element 32 after reaching the side wall 14 and is deflected downwards by it in the vertical direction. As a result, the water is guided in the direction of the bottom surface 12 essentially in the outer areas of the cleaning shaft 10 .

As in the 3 , 5 , 6 and 7 As can be seen, a further collar element 34 protrudes from the side wall 14 in the direction of the center of the cleaning shaft 10 below the impact surface 30 . This collar element 34 serves as a bearing surface for a segmentation element 36 designed as a lamella pack.

In this example, the segmentation element 36 comprises a multiplicity of circular-cylindrical segments 38 with the diameter Ds and has a height Hs. The area over the height Hs can be referred to as the segmentation area 46 regardless of the design of the segmentation element 36 . As can be seen, the height Hs is greater than the diameter Ds in the embodiment shown. In the embodiment shown, the height Hs of the segmentation element 36 corresponds approximately to twice the diameter Ds of the segments 38.

The segment 38 formed in the area of the vertical central axis 40 of the cleaning shaft 10 has a stop 42 at the lower end, which is formed as a circular ring-like projection which extends to the center of the cleaning shaft 10 . The stop 42 serves as a limitation for a pitot tube 48, which can be inserted into the cleaning shaft 10 from above, for sucking off sludge and other deposits in a deposit area 44 formed below the segmentation element 36.

In the embodiment shown, water and contaminants that have entered the segmentation area 46 can only move within a segment 38 in the transverse direction (horizontal direction) in the segmentation area 46 . This counteracts the formation of upward currents due to cross currents meeting one another, which promotes the sinking behavior of contaminants and their deposition in the segmentation area 46 and in the deposition area 44 located below. The cleaning shaft 10 according to the invention is thus a flow-optimized single shaft system in which there is no area separation within the base body 16 in such a way that a separation of an inlet area from an outlet area is recognizable, in particular by a vertical partition. Surprisingly, with a cleaning shaft according to the invention, a high cleaning effect can be achieved due to simple, essentially gravity-related deposition (sedimentation), although the entire base body 16 the inflowing and the outflowing water is "available". By this it is meant that water from all areas of the deposition area 44 can flow up through the segmentation area 46 to the drain 20 .

the 8th and 9 show a second embodiment of a cleaning shaft 10 according to the invention, which essentially corresponds to the first embodiment. For identical or at least functionally identical elements, the same reference numbers are therefore used in these figures as in FIGS 1 until 7 used. The main difference from the first embodiment is that the height H _A of the baffle 28 in the area of the outlet 20 was selected to be lower in order to accommodate the collar element 32 (in 9 not shown) to be able to use as a support surface for a filter element 50 with the height H _F. In the example shown, a filter substrate 56 is inserted between an upper support element 52 and a lower support element 54, which can be designed, for example, as gratings, through which the inflowing water flows from bottom to top. Depending on the structure, the size and the material composition of the filter substrate 56, fine (non-sedimentable) particulate substances can also be held back or dissolved substances can also be bound. It is particularly advantageous here that the high sedimentation effect of the base body 16 of the cleaning shaft 10 with segmentation area 46 already retains the highest possible proportion of sedimentable substances and these are therefore not carried into the filter element 50 with the flow in the first place. This extends the service life of the filter element 50, since naturally particulate substances that can no longer flow through the filter element 50 reduce the permeability of the filter element 50 until finally the required permeability is no longer present and the filter element 50 has to be replaced. Through the optional use of such a filter element 50, cleaning can be additionally improved in that those contaminants which do not reach the sedimentation area 44 via the segmentation area 46 and remain there, but instead flow in the direction of the outlet 20, can be captured and retained by the filter element 50 .

In the 8th and 9 It is also shown how a pitot tube 48 can be used to suck off sludge and other contaminants in the cleaning shaft 10 . Incidentally, on the 1 until 7 referred.

• - die Auftriebskräfte auf das Filterelement 50 begrenzt werden und damit eine Zerstörung des Systems bei zu großen Zuflüssen vermieden wird,
• - ein schädlicher Rückstau in das vor dem Reinigungssystem liegende Leitungssystem vermieden wird, was insbesondere bei der Regenwasserbehandlung von Verkehrsflächen von hoher Bedeutung ist. Hier kann es bei einem Rückstau zu einem Wasserstand auf Verkehrsflächen mit entsprechender Verkehrsgefährdung (z.B. Aquaplaning) kommen, außerdem könnte das von den Verkehrsflächen nicht mehr abfließende Regenwasser in angrenzende Gebäude eindringen und dort zu Schäden führen.

In the event that, with a filter element 50 used in the system, more water flows into the system than can be cleaned by the filter element 50, the water level in the inlet area rises due to the hydraulic filter resistance, until the water level finally reaches the upper edge of the baffle 26. In the case of even larger inflows, the inflowing water can then fall over the baffle 26 onto the filter element 50 and flow into the outlet 20 from above. This has the advantage that with high inflows or a relocation of the filter

• - the buoyancy forces on the filter element 50 are limited and thus a destruction of the system is avoided if the inflow is too large,
• - A harmful backwater in the pipe system in front of the cleaning system is avoided, which is particularly important for the treatment of rainwater from traffic areas. If there is a backwater, this can lead to a water level on traffic areas with a corresponding traffic hazard (e.g. aquaplaning). In addition, the rainwater that no longer drains off the traffic areas could penetrate into adjacent buildings and cause damage there.

Another advantage of the cleaning shaft 10 according to the invention is the modular structure and the use of structural elements for a later gradual extension of the cleaning shaft 10. In this regard, reference is made in particular to the collar element 32, which on the one hand causes inflowing water in the edge area to first be guided downwards, and on the other - serves as a support surface for the filter element 50 - in the event of a later expansion of the cleaning shaft 10 .

The features of the invention disclosed in the present description, in the drawings and in the claims can be essential both individually and in any combination for the realization of the invention in its various embodiments. The invention is not limited to the embodiments described. It can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art. In particular, reference is made to the possibility of using other suitable geometries for individual elements, such as the base body, the segments, the baffles, etc.

Reference List

10

cleaning shaft

12

floor space

14

Side wall

16

body

18

Intake

20

process

22

connection element

24

connection element

26

baffle

28

baffle

30

baffle

32

collar element

34

collar element

36

segmentation element

38

segment

40

central axis

42

attack

44

deposition area

46

segmentation area

48

pitot tube

50

filter element

52

upper support element

54

lower support element

56

filter substrate

ADZ

Flow cross-sectional area of the inlet

DS

diameter of the segments

HS

Height of the segmentation element

HF

Height of the filter element

HZ

Height of the baffle in the inlet area

HA

Height of the baffle in the area of the drain

Claims (8)

Cleaning shaft for decentralized rainwater treatment with a) a base surface (12), b) at least one side wall (14) extending upwards from the base surface (12), c) the base surface (12) and the at least one side wall (14) together forming a base body (16) for receiving a quantity of rainwater to be cleaned, d) at least one inlet (18) with an inlet end through which water to be treated can flow into an inlet area, e) means for generating a predominantly horizontal flow in the inlet area and f) at least an outlet (20), characterized in g) that the inlet (18) in the region of the inlet end runs in the vertical direction and as a means for generating a horizontal flow below the inlet end a horizontally aligned impact surface (30) is arranged in such a way that over the Impact surface (30) a flow deflection from the vertical to the horizontal takes place, h) below the inlet (18) and on a Level below the impact surface (30), a segmentation area (46) is arranged, in which the base body (16) is divided over a height Hs into a large number of segments (38) arranged next to one another, and i) below the segmentation area (46). unsegmented deposit area (44) is provided for depositing contaminants. Cleaning shaft according to the preceding claim, characterized in that the segmentation area (46) comprises a large number of flow cross sections arranged next to one another, each with similar cross sections. Cleaning shaft according to one or more of the preceding claims, characterized in that the bottom surface (12) and the at least one side wall (14) have an oval or circular contour. Cleaning shaft according to one or more of the preceding claims, characterized in that a collar element (32; 34) extending from the at least one side wall (14) towards the center of the shaft is formed above and/or below the inlet area. Cleaning shaft according to the preceding claim, characterized in that a segmentation element (36) and/or a filter element (50) rests on the collar element (32; 34). Cleaning shaft according to one or more of the preceding claims, characterized in that the base body (16) is made in one piece from plastic. Cleaning shaft according to one or more of the preceding claims, characterized in that a stop (42) for a pitot tube (48) is formed in the region of at least one segment (38). Method for decentralized rainwater treatment, characterized in that a) water is introduced into a cleaning shaft (10) via an inlet area of an inlet (18) and is drained from the cleaning shaft (10) via an outlet (20), the cleaning shaft (10) having a floor area (12) and at least has a side wall (14) extending upwards from the bottom surface (12), b) the water introduced in the inflow area via an inflow (18) running in the vertical direction in the area of the inflow end and a horizontally oriented impact surface ( 30) is brought into a substantially horizontal movement and c) below the inflow area and at a level below the impact surface (30) in a segmentation area (46) by a plurality of segments (38) arranged next to one another over a height Hs of a formation of Cross flows between the segments (38) is counteracted in order to fluidically favor a deposit of contaminants in a deposit area (44) under the segmentation area (46).

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